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Standard molar entropy
About: Standard molar entropy is a research topic. Over the lifetime, 1586 publications have been published within this topic receiving 29886 citations.
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TL;DR: In this paper, an abundant inorganic material in Jordan, was treated with sulfuric acid and heat treated in order to improve its performance as an adsorbent, which was used to adsorb methylene blue from aqueous solutions.
115 citations
TL;DR: Cadmium sorption behavior of granular activated carbon oxidized with nitric acid was systematically studied by sets of the equilibrium and time-based experiments under various conditions and adsorption processes were found to follow pseudo-second order rate equation.
Abstract: Cadmium sorption behavior of granular activated carbon oxidized with nitric acid was systematically studied by sets of the equilibrium and time-based experiments under various conditions. The cadmium adsorption capacity of oxidized granular activated carbon enlarged with an increase in pH, and reduced with an increase in ionic strength. Experimental data were evaluated to find out kinetic characteristics. Adsorption processes were found to follow pseudo-second order rate equation. Adsorption isotherms correlate well with the Langmuir isotherm model and the maximum sorption capacity of cadmium evaluated is 51.02 μmol/g. Thermodynamic parameters were calculated based on Van't Hoff equation. Equilibrium constant Kd was evaluated from Freundlich isotherm model constants, Langmuir isotherm model constants, and isotherms, respectively. The average change of standard adsorption heat ΔH0 was −25.29 kJ/mol. Negative ΔH0 and ΔG0 values indicate the adsorption process for cadmium onto the studied activated carbon is exothermic and spontaneous. The standard entropy ΔS 0 was also negative, which suggests a decrease in the freedom of the system.
113 citations
TL;DR: In this article, an activated carbon was prepared from the stalk of the scrap aquatic plant loosestrife by H 3 PO 4 activation and then was evaluated for its ability to adsorb 2,4,6-trichlorophenol (TCP).
113 citations
TL;DR: In this article, the specific heat, enthalpy, and entropy of coal, char, tar, and ash as a function of temperature and material composition are presented. But the standard entropy for coal is approximated by comparing the behavior of the standard entropies of a number of aliphatic and aromatic hydrocarbons.
110 citations
TL;DR: In this paper, the relationship between the thermodynamic quantities and the defect equilibrium of the solid solution La1−xSrxFeO3−δ was clarified using the authors' previously reported nonstoichiometry data.
109 citations